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Income Taxes - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 29, 2019
Sep. 30, 2018
Dec. 31, 2018
Income Taxes [Line Items]      
Tax savings due to the tax holiday $ 12.0 $ 8.9  
Tax savings due to the tax holiday, per share $ 0.07 $ 0.05  
Reduction in un recognized tax benefits $ 22.4    
Accrued interest and penalties 0.5   $ 0.3
Interest and penalties related to income tax, expense (benefit) 0.2 $ 0.1  
Uncertain tax positions 13.6   $ 43.4
Net decrease in uncertain tax positions 29.8    
Minimum [Member]      
Income Taxes [Line Items]      
Potential tax reserve 5.0    
Maximum [Member]      
Income Taxes [Line Items]      
Potential tax reserve 11.0    
Research Tax Credit Carryforward [Member]      
Income Taxes [Line Items]      
Net decrease in uncertain tax positions $ 7.2